AVS Special Member
Join Date: Mar 2007
Location: Long Beach, California
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Fifty feet is not a problem for sound quality. I've run hundreds of feet. It could potentially be a problem for hum.
If your devices are fifty feet apart, there is the possibility that they could be at slightly different ground levels, and that could cause hum. The solution could be a simple ground wire between devices (assuming the difference is small), or an isolation transformer.
Also, if that fifty feet of cable is running along other cables that emit electrical noise, there is a possibility of picking up that noise in the audio. That also can be mitigated.
So my suggestion is to try it. Chances are you will be fine.
Ethan and I cross-posted. He has a good point about cable capacitance. I typically use low-capacitance cable.